Tough situation.

I need some help ive been with my bf a little over four months and i cant help but be attracted to my best friend. hes 22 and has always been there for me weve had protected sex twice and it was my first time ever. And then the second time was yesterday and i was on top it was amazing. So, problem is my bf is controlling and pushy. Im 16. Should i leave bf for best friend or wait til im 18 for my best friend? Comment please!